A few electric bulbs are connected in series to the 220 V mains . One bulb fused , the remaining bulbs are again put in series and connected to the same supply of 220 V. In which case will the bulbs glow brighter and why ?

Explanation

In the second case , the bulbs will glow brighter .
Let n be the number of bulbs and the bulbs be connected to 220 V mains .
So , potential difference acrross each bulb , `V_(1)=(220)/(n)V.`
One bulb out of them is fused So , now the potential difference across each bulb,
`V_(2)=(220)/(n-1)V.thereforeV_(2)gtV_(1)`
So , in the second case , the bulbs will glow brighter .